I have the same issue (I assume you meant error e230), I've tried different browsers, using the game launcher, trying with a VPN from different countries, which actually helps the to much traffic issues at times. I have disabled all extensions and pop up blockers but no matter where when and how I always get error e230 trying to click the join button.
I assume it may be some sort of account requirement that I haven't met, I have tons of the silver points, I've only purchased one game for 19 cents through the service and had no issues with that. But if I can't join the giveaways it doesn't give me faith in purchasing more from here.
